Nu-nu-dibenzylsulfamyl benzoic acid



United ates i 2 V 2,805,250 [Mouse'per es in g./kg. (after dissolution in dimethyl formamide) N-N-DIBENZYLSULFAMYL BENZOIC ACHD Werner- Zerweck, AdOlf Stachel, and Armin Kutzsche, benzyl propyl dimethyl aqueous Frankfurt am Main-Fechenheim, Germany, assignors 00111- 7 00111- 'P i y to Cassella Farbwerke Mainkur Aktiengesellschaft, pound pmmd' nii e te, Frankfurt am Main-Fechenheim, Germany, acompany Germany 3 dos. tol 0. 294 0.025 2. 94 V 5.3

No Drawing. Application July 11, 1955, dos. let 0.59 0066' 5.0 7.1

Serial No. 521,396 7 g g e Claims priol'ity, application Germany .Iuly 15, 1954 CHRONIC TOXICITY V 1 Clam 26G 518) A daily dosage of A .of the dosis tole-rata ofthe This invention concerns substances acting as retarding benzyl mpo .a-SeQ0I1d-W1ieS of tests, O i agents for the excretion of drugs. P PY p d Was g v mi during a 4 y ialld Wehave .now found that substances of an essentially the .PQ of Observation w s X d for a l l fi 4 greater effectiveness which delay the excretion of mediweeks- No p m f iulliiss 63 50 5 e h W 1 cines such as para-aminosalicylic acid or penicillin, 0f noted i Particular, 0 u at o ur X-ra i contrast agents or of similar substances applied Corresponding experiments w t b t gav a a g in the human body, are obtained by reacting carboxyo t V e 3 benzene-sulfonic acids or their functional derivatives with V 7 I HISTQLOGY dlben'zylamme or lts substlwtlm Products- A histologic study of-the organs of mice 'andrabbits The Products thus obtalned correspond to the general to which the aforesaidchronic doses were given, revealed formula no pathologic changes.

onz SYMPTOMS OF POISONING H000 SO2N Doses of 8.16 grams/kilogram of the benzylcompound G given to mice led to death after 10 days without special (wherein the benzene rings may contain f th clinic, signs. An anaemia, a loss of haemoglobin and a stituents) leukocytosrs occurred. Functionaltests of 'hver an'd kld- They are strongly superior to the known excretion rei q negatlve results h Inhibition tarders, for example, to the commercially available parai coag anon wasyzibout .Hlsiologlc eiiammatlons carboxy benzene dipmpyl sulfamide This is shown by revealed an enteritis and a cardiac hver of minor degree. the following experiments, in which a Product of the kidneys Showed n.funct1na1damage' These present application namelythe mgs were also made w1th the propyl compound. The changements m organs were not present with all animals. RETARDATION OF THE EXCRETION OF "PARA- HOOCOSOHK AMINOSALICYLIC ACID (PAS) Q 40 The experiments to enhance the action of PAS after which will be called benzyl compound in the following its oral administration by an additional oral application statement, was compared to the known compound of the .benzyl compound or the propyl compound which /CH2.CHz.CH3 were given to the 'efiect of g 0 i 1) retarding the excretion CH2.CH2.CH3 (2) raising the serum titers zggggg g i g gg g z gg ifi ggggggga 32:: were carried out with rabbits. The individual animals made in respect of para-aminosalicylic acid and of penibehave Filfierent m fins respect (as It is the i Wlth the 6min. s human body). Therefore the normal excretionof PAS ACUTE TOXICITY afie its Soral agmmllstratnglilr was deternnanled wi thdeaflh 11a it. ome ays ater e same .anim receive t e lMouse per 08 m grams/kg siiiigaiii s iii were gum in the form of same dossage of PAS, 1'. e. 1 of the dosis tolerata, with hem 1 the retarding agent to be examined. Each experiment as compognd 53 .25 a whole was repeated for several times.

i 55 We marked on the X-axis the time and on the Y-axis m1 7 My 140 the concentration. The planes formed by drawing the -1 excretion curves were cut out and weighed. Thereby it v [Rat per os gJkg. (in form of substancyl action after a benz l. propyl According :to Wilhelmi, et al. (E. Wilhelmi and C. wmpmnd compound Sanz,'Schweiz. ZITuberk. IX,'2 96'- 305 (1952); HJS teinlin and E. Wilhelmi, SchweizJZ. Tuberk. IX, 30641-2 332: i331::::::::::::::::::::::::::::::::::::: 18:3 i122? (1952), only t values obtained free PAS shall be used for an evaluation of excretionr-etarders.

- total PAS total PAS difierenee= free PAS free PAS difierence= preparation without. with changein without with changem retarder retarder plane of retarder retarder plane of action action benzylcompound. 70.3 192.8 122.5 61.3 179.8 115,5 propyl compound..- 72.7 181.5 109.? 61. i 156. W 9%.8

Values in mi1ligrams=weight of curve plane.

. Patented Sept. i 3, 1957 When the value obtained for the propyl compound is shown as 100% the, following relations are to be noted.

The benzylcompound is better than the propyl compound. The percentagevalue of the total PAS with the ibenzyl compound is 112%, i. e. 12% higher than the corresponding value for the propyl compound. Related to propyl compound total PAS=100% there are with the benzyl compound 108.4% of free PAS, i. e. in fact 96% of' the total PAS with the benzy-l compound. This shows another property of the benzyl compound, namely to inhibit the acetylation of the para-aminosalicylic acid because only 4% appear as acetylated PAS whereas 13.3% do so with the propyl compound. I

If one follows Wilhelmi et al. and uses only the values for free PAS for an evaluation of excretion retarders the relation 118.S:94;8, i. e. benzyl compoundzpropyl compound, shows a 25% superiority of the benzyl compound.

These results were obtained with A of the amount necessary for molar equivalence to the propyl compound, which fact still emphasizes the significance of the benzyl compound.

' RETARDATION OF THE EXCRETION OF PENICILLIN difierence of the penicillinyalues between the total plane difference series of the preparation of action of with respect benzyl penicillin to penicillin compound and alone that of the p w compound (latter=l%) J Mg. My. Percent penicillin alone 34. 5 X X penicillin-i-propyl compound. 170. 4 135. 9 100 penlcillin+benzyl compound. 240. 5 206. O 151.5

(X) After deduction of the blank value.

The values given in the table were'determined by Weighing the planes of action. 1 e

[Average values of penicillin (units per 1 cubic centimeter of serum).]

after 6 hours after 3 hours after 0 hours penicillin alone (37 experiments) penicillin+propyl compound (7 exper ments). penicillin-i-benzyl compound (7 experiments).

can

Summary Sulfonamides of the constitution alkyl alkyl are known to be able to inhibit the excretion of drugs, for instance, para-aminosalicylic acid, penicillin or diodrast. Up to the present the para-carboxy-benzene-di-npropyl-sulfamide (propyl compound) is known to be the best of these compounds. In the course of our research, however, the para-carboxy-benzene-dibenzyl-sulfamide proved to be superior to the para-carboxy-benzenedi-n-propyl-sulfamide in respect of (l) Retardation of excretion (for free PAS about 25% for penicillin about 40%),

(2) Increase of the titers of action (see preceding table) (3) Inhibition of the acetylation of PAS (35-fold better than the propyl compound),

(4) Compatibility (about 4l0-fold according to species and solution).

As the propyl compound was up to now the best substance (better than f. i. the ethyl and the butyl compound) and our new benzyl compound is again better than all these compounds, the new benzyl compound shows a diiterence notin degree but in kind.

p-Carboxybenzene-dibenzyhsulfamide in form of its sodium salt proved to be active as a retarding agent in the same way as the basic substance; the experiments have been :carried out with rabbits using drugs such as penicillin or PAS. An application of the sodium salt which exhibits a good solubility with a marked susceptibility to carbonic acid is clinically of great significance in view of the use of drages.

The following example is given for the purposes of illustrating the invention, the temperatures being in degrees centigrade.

EXAMPLE Into an aqueous suspension of 591 grams (3 moles) of dibenzylamine in 500 cubic centimeters of distilled water there are introduced at 20, with stirring, 220- grams (1 mol) of para-carboxy-benzenesulfochloride. The temperature shall not exceed 25 Thereafter the mass is still stirred for 10-12 hours at room temperature. After standardizing the mass with 20% hydrochloric acid to show a Congo-acidic reaction, the mixture of para-carboxybenzene-dibenzyl-sulfamide and dibenzylamine-chlorohydrate is separated by filtering with suction, dissolved in an excess of Zn-caustic soda lye and extracted with ether for several times in order to remove the dibenzyl-amine.

From the aqueous alkaline layer there is precipitated by means of diluted hydrochloric acid the Para-carboxybenzene-dibenzyl-sulfamide. It is filtered by suction and washed with water until neutral. After recrystallizing from alcohol, the para-carboxydvenzene-dibenzyl-sulfamide is obtained in the form of white, felted needles of a melting point of 206.

The ether is removed by distillation and the recovered dibenzyl-amine is used for further reactions.

Products of similar properties are obtained by using instead of the dibenzyl-amine or the carboxybenzenesulfochloride their substitution products which may contain, for example, one or several hydroxy, alkyl or alp-Carboxybenzene-(benzyl mono-m methoxy benzyl)- sulfamide (melting point: 155, white laminae when crystallized from alcohol),

p-Carboxybenzene-(benzyl mono p methoxy benzyl)-sulfamide (melting point: 164, white prisms),

p-Carboxybenzene-(benzyl mono p chloro benzyl)- sulfamide (melting point: 179-180, white prisms when crystallized from alcohol).

We claim: As a new which agent retarding agent for the excretion of drugs corresponds to the formula GHQ References Cited in the file of this patent UNITED STATES PATENTS 

